Hydraulic oil-delivery system



Aug. 31 ,1926.

F. G. FARR HYDRAULIC OIL DELIVERY SYSTEM Filed Feb. 9, 1922 vwewtoz Faoamm. G ARR.

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Patented Aug. 31, 1926.

UNITED STATES FREDERICK G. FARR, OF NEW YORK, N. Y.

HYDRAULIC OIL-DELIVERY SYSTEM.

Application filed February'9, 1922. Serial No. 535,426.

The invention relates to hydraulic oil storage and'delivery systems of that type in which the hydrostatic head of the water or displacement fluid requisite for the,

elevation and delivery of the oil is gradually built up as shown in my prior Patent No. 1,299,567,-issue'd April 8,1919. Where such systems are used for the retailing of oil, it is usual to provide the delivery conduit with a meter measuring the amount deliv' ered and also with a siphon breaker. One objection to such systems is the time required to elevate the oil from the storage tank to the delivery level, This is occasioned by the gradual building up of the displacement head and the falling of such head to its low level after each delivery operation. With my improved construction I have avoided such delay by the provision of means for holding the liquid in the delivery conduit from falling back, and this means performs the further function of a siphon breaker dispensing with the necessity of a conduit rising to above the hydrostatic head of oil.

The drawing represents in diagram a hydraulic delivery system to which my improvement is applied A is thestorage tank, B an oil delivery conduit rising therefrom, C the meter, and D the discharge. from the meter which is connected by afle-xible conduit or other suitable means (not shown) with the delivery nozzle. Eis the water supply conduit, F the controlling valve, T the drain connection and G the riser in which the hydrostatic head is built up, these parts being the same in general construction as in my former Patent No. 1,299,567. As-has been stated, it is usual to provide a siphon breaker in the delivery conduit so as to prevent siphonicaction. Where the siphon breaker is formed byan open-ended tube,

this must rise to a point above the highest head, which is placed upon the oil, but it is frequently inconvenient to extend the pipe upward in this mannerr. Also, as has been stated, when the head upon the displacement fluid is built up, an appreciable time interval is required for the elevating of the oil in the delivery conduit. I therefore place at the highest point in the delivery conduit B a float-controlled valve. This, as shown, comprises a casing H in which is arranged a. float I having at its lower end a valve J which operates as a' check and automatically seats as soon as the level of the liquid falls in operation, the oil will be normally held closed by a cap valve P to prevent reverse flow. Thelsumbelow the flotation point. At the upper end of the float I is a second valve K which, upon rise of the float, will seat to close a vent opening at the upper end of the casing H. This vent is therefore automaticall opened when the float falls and by the a mission of air under atmospheric pressure will prevent any siphoning of liquid. Thus,

at the level slightly above the valve J by the seating of said valve and each time the valve F is opened by the operation ofa pull rod L or other controlling means, the valve J will be lifted from it's. seat andthe oil delivered by the meter C to the dischar e end D. At the same time the rising of t 0 oil in the casing H will raise the float I and close the valve K, preventing'the escape of liquid. This position of parts is-maintained until the valve F is again closed, whereupon the falling of the float'I and the'liquid level within the casing H will simultaneously open the valve K to establish an air vent or a siphon breaker and close the valve J to prevent the descent of the column of oil in the conduit B. If it is desired to also prevent the falling of the column of displacement liquid in the riser G, a check valve M may be placed in said rise-r. The riser G is preferably surrounded by a jacket R R at the upper end and provided with the air vent openings S at the lower end thereof. Thus, the upper end of the riser G is at all times subjected to atmospheric pressure.

The system is filled by asuitable fill connection such as N, which is connected by a conduit 0 tothe conduit B with a check mit head-formed by the riser G is below the casingiH so that delivery of water is prevented.

Where the system is used for the delivery of oil in locations exposed to varying temperatures, it may be necessary to release the water column in the riser so as to prevent freezing of the same. This is accomplished by means of a button Q which, when pressed, will unseat the check-valve M and permit the column in said riser to fall.

One very important advantage of my con struction is that itprevents false registration of the meter. For instance, assuming the riser B is filled with air as would be the case when the tank is first filled, and also assuming that there is -no air vent in the a air.

system then upon the first drawing of oil the air from the riser would be forced throu h the meter and registered as so much oil. guch a false registration is prevented with my device as the air vent K is always open until the liquid in the riser B reaches the float H. Another advantage of the air vent valve is that it permits the ingress of air in case the valve J should leak. As a matter of fact all such valves will leak at certain times and without the air vent this would cause the drawing of air through the discharge end of the conduit D and into the meter forcing the oil out from the same and filling the meter and the conduit with This again will cause inaccurate registration. It is also important that the discharge end of the conduit D should be slightly higher than the check valve J. This prevents the draining of oil from the section of the conduit in which the meter is placed which would occur if the check valve J were placed higher than the discharge end of said conduit.

What I claim as my invention is:

1. In a hydraulic oil delivery system, the combination with a storage tank, a valvecontrolled connection for the displacement liquid and a riser in which the hydrostatic head of said displacement liquid is gradually built up, of an oil delivery conduit rising to a point above said first-mentioned riser and having its delivery end below the highest point thereof, a casing located at the highest point in said delivery conduit, a float within said casing, valves actuated by said float to respectively seat upon the rising and the falling of the same, the first for closing an air vent and the latter for closing the conduit to prevent fall 'of the liquid column therein, and a check valve in said riser for the built up pressure of the displacement liquid, preventing fall of the liquid column therein.

2. In a hydraulic oil delivery system, the combinationwith a storage tank, means for placing said tank under a normal hydrostatic pressure and a delivery conduit rising from .said tank to a point above the level corresponding to said normal hydrostatic pres sure and having its delivery end below the highest point in said conduit, of a float located at the highest descent of the liquid column in said conduit,

- and a siphon breaking vent also controlled by said float,

oint in the conduit, a valve operated by said float for preventingtank to a point above the level of the oil corresponding to said normal hydrostatic pressure and having its delivery point adapted to extend below said level, said conduit having an atmospheric vent below the level corresponding to said increased pressure, and a float valve in said conduit adapted to close said vent under increased pressure and to open the same under normal pressure whereby siphoning of the oil is prevented.

4. In a hydraulic oil delivery system, the combination with an oil storage tank, a conduit for the displacement liquid connected to the bottom of said tank, and means for gradually building up a hydrostatic head in said displacement conduit, of an oil delivery conduit rising to a point above said displace ment conduit and having its delivery end adapted to extend below the top of said displacement conduit, a meter in said delivery conduit, said delivery conduit having an air vent on the inlet side of said meter at a point below the level corresponding to the maximum head upon the oil, and a float valve. in said delivery conduit adapted to close said vent under increased pressure and to open the same under normal pressure whereby siphoning of the oil is prevented.

5. In a hydraulic oil delivery system, the combination with an oil storage tank, a conduit for the displacement liquid connected to the bottom of said tank,'and means for gradually building up a hydrostatic head in said displacement conduit, of an oil delivery conduit rising to a point above the top of said. displacement conduit and having its delivery end adapted to extend below the same, said delivery conduit having an air vent at a point below the level corresponding to the maximum head upon the oil, a meter between said air vent and the delivery end of said conduit, a valve for closin said vent, a check valve in said delivery con uit, and a float in said delivery conduit between said valves adapted to operate the same by the rising and falling of the oil due to the change in hydrostatic head upon the storage tank.

6. In a hydraulic oil delivery system, the combination with an oil delivery conduit rising above the normal head upon the oil and having its discharge end below the highest point in said conduit, of a casing at the highest point of conduit having an air vent at its upper end, a float within said casing and valves respectively seated by the rising and the falling of said float, the former closing said air vent and the latter closing the delivery conduit to prevent falling of the liquid column, and a meter in said conduit between the discharge end thereof and said 

